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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9971bde5c2849f82cae67a2888fc39ddd92be46be81205c5085c786f8323859c' 
  AND token = 'c+CVFclezE9PiOWsGQ0p7x3qSy+kcuG5D/MU+FZYvLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}